The production mechanisms of OH radicals in a pulsed direct current plasma jet

Liu, X.Y., Pei, X.K., Ostrikov, K., Lu, X.P., & Liu, D.W. (2014) The production mechanisms of OH radicals in a pulsed direct current plasma jet. Physics of Plasmas, 21(9), 093513-1.

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The production mechanism of OH radicals in a pulsed DC plasma jet is studied by a two-dimensional (2-D) plasma jet model and a one-dimensional (1-D) discharge model. For the plasma jet in the open air, electron-impact dissociation of H2O, electron neutralization of H2O+, as well as dissociation of H2O by O(1D) are found to be the main reactions to generate the OH species. The contribution of the dissociation of H2O by electron is more than the others. The additions of N2, O2, air, and H2O into the working gas increase the OH density outside the tube slightly, which is attributed to more electrons produced by Penning ionization. On the other hand, the additions of O2 and H2O into the working gas increase the OH density inside the tube substantially, which is attributed to the increased O (1D) and H2O concentration, respectively. The gas flow will transport high density OH out of the tube during pulse off period. It is also shown that the plasma chemistry and reactivity can be effectively controlled by the pulse numbers. These results are supported by the laser induced fluorescence measurements and are relevant to several applications of atmospheric-pressure plasmas in health care, medicine, and materials processing.

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ID Code: 88879
Item Type: Journal Article
Refereed: Yes
Additional Information: Partial support by the Australian Research Council and CSIRO's Science Leadership Scheme is also kindly acknowledged.
DOI: 10.1063/1.4895496
ISSN: 1070-664X
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
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Copyright Owner: Copyright 2014 American Institute of Physics
Deposited On: 08 Oct 2015 04:10
Last Modified: 20 Oct 2015 00:13

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